The silicone that's used by German designer Tanja Hartmann makes those rings look so real that you immediately want to start sucking on them. Luckily they are made out of silicone and not sugar and egg whites, because that makes t...The silicone that's used by German designer Tanja Hartmann makes those rings look so real that you immediately want to start sucking on them. Luckily they are made out of silicone and not sugar and egg whites, because that makes them a lot more durable then the real thing and trust us, sucking on your finger doesn't really go down all that well in public.